Rotor construction.



E. W. KENNEDY.

ROTR CONSTRUCTION. APPLICATION FILED H1117, 1913.

Patente@ Ust. 14, 1913 5.1mm, afa/sofa in', r t @is FRANK W. KENNEBY, VOF y' iREIN'T{rN, NEW JERSEY, ASSIGNGR- CCO DE LAVAL STEAM TURBINE COMEANY, 0E' NEW YORK, N. Y., GRPGRTZION NEW' JERSEY.

GIOR CONSTRUCTEGN.

Application tiled February TJ, 313.

To all whom if may concern Be it known that I, FRANK EV. KENNEDY, a citizen of the United States of America, and resident of Trenton, in the county of Mercer and State of New Jersey, have invented certain new and useful improvements in Rotor Construction, of which the following is a specification.

My invention relates to improvements 1n rotor construction, particularly applicable to the rotors of steam turbines, but also applicable to centrifugal pumps; and my invention comprises improved means for sc curing a plurality of bucket wheels or other rotor-sections to a shaft which such rotorsections drive, or by which they are driven. My invention consists in the features hereinafter described and particularly pointed out in the appended claims.

The object of my invention is to improvey the construction of rotors, and particularly to provide improved means for securing rotor sections to their shafts.

I will now proceed to describe my invention with reference to the accompanying' drawings, and will then point out the novel features in claims.

Figure lshows a fragmentary longitudnal section of a steam turbine comprising a plurality of bucket wheels secured to a shaft in accordance with my invention; Fig. 2 shows a transverse section on the line of Fig. l; Fig. 8 shows a fragmentary longitudinal section of a centrifugal pump, the

impcllers of which are secured to the pump shaft in accordance with my invent-ion.

Referring first to Figs. l and 2, l designates the shaft of the turbine, and 2 the turbine casing. 3 designates the usual diaphragn'is dividing the interior of the turbine casing into a plurality of wheel-chambers, and provided. with nozzle-apertures 1i. 5 designates a ring, formed separately from shaft 1,but secured rigidly to said shaft, as for example, by being shrunk on tol said shaft. In practice, before this ring 5 is allowed to grip the shaft it is positioned accurately on said shaft both longitudinally and angularly. ,t3-G designate bucket wheels, mounted somewhat loosely on shaft.

l they may have a drive tit on the shaft, but are not keyed to the shaft, except as hereinn after described. 7-7 designate rings which slide over the ends of the shaft. They may be secured against angular rotation with re reis.

spect to the shaft by keys 8; but such keys are not necessary in most cases. 9-9 designate spacing rings between t-he several bucket wheels. allie ring 5, the bucket wheels '6, the end rings 'Y and the spacing rings 9 are bored for the reception of through bolts.

prevent rotation of the bucket wheels with reference to the sl'iaft.

in constructing the parts of the turbine, after the ring 5 has been shrunk upon the shaft, said ring is carefully turned eXternally and is ground at the sides to true surfaces. rThe bucket wheels 6, -and spacing rings S) are similarly ground at the sides so that all can fit closely together. The ring 5 is carefully Alocated angularly, with respect to the key slots for the keys 8 (if such keys are to be employed) so that when the parts are assembled the holes in said ring 5 for the `throu ,rh bolts l0 will register with the holes in the rings 7 for such through bolts, when the keys 8 are in place. The bucket wheels and spacing rings', when placed on the shaft, are similarly alined soy holes for the passage of thel that their through bolts will register with the holes for the through bolts of ring 5. The rings 7 are then applied and the through bolts passed through the registering holes and the nuts ll applied and screwed up, the pressure exerted by said screw nuts against the rings,'and so against the bucket wheels and the spacing rings 9, pressing these members together very tightly; so much se that the frictional engagement of these members is ordinarily suilicient to precludel any relative rotation of any of the members on shaft l, without putting any particular transverse stress on the thrbugh bolts l0; but, as above stated, keys 8 may be provided for the rings 7, whereby these through bolts are held at the ends as well as in the center against lateral motion. This method of securing the several parts of the rotor together obviates occasion forlthe provision of long key ways in the shaft, and corresponding keys; 4and centrifugal pumps as illustrated in Fig. 3

wherein 12 designates the pump shaft, 13 the pump casing, 14: the impellers mounted upon said shaft, 15 a ring mounted upon said shaft 12, and corresponding to the ring 5 of Fig. 1, and 16 designates spacing rings between the several impellers. 17-17 designatel end bushings corresponding to the end rings 7 of Fig. 1,. In Fig. 3 I have not shown the bushings 17 as keyed to the shaft 1. 10 designates a through bolt, as in Fig. 1, and 11-11 end nuts.

IVhat I claim is:

l. A rotor construction comprising in combinationa shaft, a ring secured thereto, rotorvmembe'rs mounted on said shaft, Said rotor members and fixed vring provided with one or more registering boltapertures, and one or more through bolts passing through said bolt-apertures and provided With means for pressing the several rotor members together against said fixed ring, whereby the frictional engagement of said members with each other and with the fixed ring, supplemented if occasion arises by the keying aotion of such throughl bolt or bolts, securesV the several rotor members against rotation with respect to said shaft.

2. A rotor construction comprising in combination a shaft, a ring secured thereto, rotor members mounted on said shaft, said rotor members and fixed ring provided with one or more registering bolt-apertures, and one or more through bolts passing through said bolt-apertures and provided with means for pressing the several rotor members togel-her against said fixed ring, whereby the fr'otional engagement of said members with each other and with the fixed ring, supplemented if occasion arises by the keying action of such through bolt or bolts, secures the several rotor members against rotation with respect. to said shaft, the said rotor members Comprising also end rings through which the said bolt or bolts pass, and keys securing said end rings against rotation with respect to said shaft.

In testimonyv whereof I have signed this specification in ythe presence of two subscribing witnesses.

FRANK W. KENNEDY.

I'Vitnesses:

A. E. ROBINSON, C. It. VVALLER.. 

